Grant Whitacre
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Articles
Recent activity by Grant Whitacre-
Q&A: Why do I sometimes see unexpected faults when they should not be happening?
Full Question: Why do I sometimes see unexpected faults on the Apollo3 Blue, such as INVSTATE and NOCP, when there is no reason why they should be happening? Answer: The problem is caused by the...
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Q&A: Is there anything special that I need to do when using a 32.768 kHz crystal to clock the Apollo3 B0?
Full question(s): Is there any special initialization that needs to be done when using a 32.768 kHz crystal to clock the Apollo3 Blue, revision B0? Answer(s): This only applies to Apollo3 B0 silico...
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Q&A: Why doesn't the Makefile work in the SDK's Apollo3_EVB BSP folder?
Full question(s): I need to make a change to the default pin mapping, and I am trying to rebuild the am_bsp_pins.c and .h files for Apollo3 in the SDK 2.1.0 release. However, after I make my chang...
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Q&A: How can I get visibility to HAL and BSP C-code execution when debugging?
Full question(s): I want to have visibility of, and single-step through, C code execution for HAL and BSP functions while debugging. What do I need to set in the IDE to do that? Answer(s): In I...
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Q&A: Do Ambiq RTCs prevent POR from occurring as part of its noise immunity?
Full question(s): I am concerned about the noise immunity of AM1805AQ and AM0805AQ. VCC drop causing POR is described on page 44 of AM18x5 Datasheet. High frequency noise (about 10 ns pulse) exis...
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Q&A: How do you program OTP Flash on Apollo MCUs?
Full question(s): How do you program One-time-programmable (OTP) Flash on Apollo MCUs? Where can I find information about it? Are there HAL functions in the AmbiqSuite SDK for programming and re...
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Q&A: What are Apollo2's power supplies and domains?
Full question(s): Q&A: What are Apollo2's power supply inputs and what do they power internally? Answer(s): The diagram below shows all the input/output power domains for Apollo2. The three inp...
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Q&A: How to work around the incorrect CLKOUT settings in am_hal_clkgen_clkout_e?
Full question(s): The values in the enumeration am_hal_clkgen_clkout_e in SDK2.1.0 do not match Apollo3's datasheet 0.9.1. Thus the CLKOUT does not function as expected. How can this be worked ar...
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Q&A: Is there an example showing how to use the CQ_RAW mode?
Full question(s): Is there an example showing how to use the CQ_RAW mode in MSPI to IOM transfers? (The CQ Raw feature enables pre-constructed CQ using the raw interface). Answer(s): Yes. See at...
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Q&A: Why am I getting a bus fault error when I run XIP code?
Full question(s): I am running execute-in-place (XIP) code with the MSPI module on the Apollo3 Blue, and I am experiencing bus fault errors. This fault is indicated in the core's BusFault Status R...